Just a thought
Tim: Some of the other folks on this forum are much more knowledgeable than I about fitment from year to year but I would want to get the car and take the parts out myself because I would not trust someone else who might just cut allot of stuff out. You may be able to upgrade lots of stuff from that year and fill in any missing tools from the tool box in the trunk. You never know what you'll find- the window motors may fit, gas tank?, and one of the things I plan on doing is taking all the miscellaneous hardware off like the door brakes and latches, etc. Not to mention all the nuts, bolts and trim screws. Also, if you're going to swap the motor and trans from an '85 you probably will need all the computer stuff/wiring plugs and pieces and some of the brackets. Sometimes it may be easier to change-up an engine bracket than fabricating a new one so that's just my take. On Monday I'll try to post what I can about the parts that I found interchangeable from the '84 633 CSI to the '74 3.0 CS and I hope that will help you. Also, as I mentioned, I take lots of pictures so I can send some of those along as well.
Good luck!